<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            outline: 0;
        }

        .box1 {
            margin: 10px;
            width: 100px;
            height: 100px;
            background-color: blue;
            position: relative;
            /* overflow: hidden; */
        }

        .box2 {
            /* float: left; */
            /* position: absolute; */
            /* position: fixed; */
            display: inline-block;
            height: 50px;
            width: 50px;
            background-color: red;
            text-align: center;
            margin: 0 auto;
            transform: translateX(25px) translateY(25px);

            /* margin-left: 25px;
            margin-top: 25px; */
            /* box-sizing:content-box; */
            /* margin-right: 25px;
            margin-bottom: 25px; */
        }
    </style>
</head>

<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
<script>

</script>

</html>